Wood-grinder for pulp-making



( Modem 2 Sheets-Sheet 1.

- B. EILERS, Jr.

WOOD GRINDER FOR PULP MAKING. No. 402,425. a Patented Apr. 30, 1889.

HP H4: f K w m w x I r K d l! M 1* 1* 1 v x I 9 Q P W l "Walt-11 1535 es. Iva/$70602.

2/7/8 MOI-ways,

2 SheetsSheet 2.

(No Model.)

B. EILERS, Jr. WOOD GRINDER FOR PULP MAKING.

No. 402,425. Patented Apr. 30, 1889.

we natal.

- TVi-nesses.

nplmr, Waihinglom n. c

UNITED STATES PATENT OFFICE.

BERNERD EILERS, JR., OF ROCHESTER, NEW YORK.

" WOOD-GRINDER FOR PULP-MAKING.

SPECIFICATION forming part of Letters Patent No. 402,425, dated April 30, 1889.

Application filed July 9, 1888. Serial No. 279,439- (No model.)

To all whom it may concern.-

Be it known that I, BERNERD EILERS, J r., of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Wood-Grinders for Pulp-Making; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, and to the figures and letters of reference marked thereon.

My present invention relates to machines for grinding wood for making wood pulp, and has for its objects to improve the construction and operation of such machines, rendering them less liable to damage by reason of the bursting of the grinding-cylinderby centrifugal force when the pressure is removed from one or more of the blocks being ground; to simplify and improve the connections between the feeding devices and the motor for operating them, whereby there will be no lost motion, and also to provide a more simple device for pressing said blocks upon the cylinder or stone; and to these ends the invention consists in certain novel constructions and combinations of parts, allas will be hereinafter fully described, and the novel features pointed out particularly in the claims at the end of this specification.

In the drawings, Figure 1 represents a side elevation of a machine constructed in accordance with my invention; Fig. 2, an end view; Fig. 3, a sectional view taken on the line w w of Fig. 2 5 Figs. 4 and 5, perspective and sectional views, respectively, of the valve for operating the presser-motor.

Similar letters of referencein the several figures indicatesimilar parts.

Heretofore in the class of machines to which my present invention relates it has been customary to provide anumber of pockets around the periphery of a grinding stone or cylinder for the reception of the blocks of wood or other material to form the pulp, each with an independent pressing device to hold the wood against the cylinder or stone and feed it as it is ground up; but there are several obj ections to this form of apparatus, the principal one of which is that, as the blocks are pressed into contact by hydraulic or other powerful pressure, they operate as brakes on the cylobjection.

inder, tending to retard its rotation, and as the speed of the cylinder should be very great, powerful motors or engines must be employed to overcome this force and drive the cylinder properly. In this form of machine, when desired to insert a fresh block of wood into one of the pockets, the follower is retracted, thus removing so much load from the cylinder, and consequently increasing its speed, and as the pressure of which it is relieved is very great the speed of the cylinder will be so increased as to render it liable to fiy to pieces by centrifugal force. The pressure devices heretofore used are usually single acting-that is to say, they operate to press the block directly upon the cylinderand when necessary to insert a fresh block they make a dead-stroke away from the cylinder, thereby consuming unnecessary time and power.

A further objection to the old form of grinder lies in the fact that the blocks and pressure being applied on but one side of the cylinder-bearing cause it to wear rapidly, or if on opposite sides they are filled separately and for a time (during filling) are open to this These objections and others are fully overcome in my present machine and additional advantages are presented, among which may be mentioned the fact that the operation is continuous, and the same number of blocks under the same pressure are in contact with the cylinder all the time itis in operation.

Consequently there is no opportunity for va riation in the speed of the cylinder other than that caused by the motor driving it, and also there are no dead-strokes of the motor device cover, B, and segmental plates G G G G, and

within this is located the grinding-cylinder O, of any suitable material. This cylinder is preferably composed of stone, though any other material could be employed, hung upon a suit-able shaft, 0', journaled in bearings a a,

in the side plates of the frame, and is adapted to be rotated at a high rate of speed by a suitable motor.

011 opposite sides of the cylinder are located two presser or feed plates, D D, pivoted upon shafts D D, mounted. in suitable bearings, E E, on the side plates, and having ribs F F at their centers about in line with the shaft 0 on the sides toward the stone, while above and below the rib they are curved to correspond substantially with the periphery of the cylinder. The boxes E, on which the shafts E are mounted, are adjustable in suitable ways formed on plates A A, so that the pressershafts can be adjusted nearer the cylinder as the latter wears. At the ends of the presserplates, and extending between sides A A, are segmental guard-plates G G G G, secured in any suitable manner to said sides and constituting the ends of the pockets for the material formed by the presser-plates, the sides A A and the cylinder, as shown, being preferably curved to approximately correspond to the arcs traversed by the ends of D D when turned on their pivots, so as to make a reasonably-tight joint and prevent material from flying out, and those at the bottom of the chambers serving as the supports for the blocks of material.

Suitable openings closed by doors H H H H are provided in the side plates, AA, or either of them, for affording access to chambers I I I I when necessary to place fresh blocks of material therein.

Located upon the upper portion of the easing is a hydraulic cylinder, K, in which operates a piston, L, connected to the pistonrod M, passing out of the ends through suitable stufiing-boxes, m m, and projecting some distance beyond them, as shown. To the ends of this rod are connected the upper ends of presser-plates D D, the connections between them preferably consisting of collars N N, secured upon the rod by suitable screws, 'n, provided with a depending portion, to which are pivoted the ends of links 0 O, the other ends being pivoted to the extensions D D on the plates, as shown. These connections are so located relative to the presserplates and piston as that the plates will be tilted in the same direction when the piston is moved-that is to say, when the piston is at the right-hand end of the cylinder the pocket or chamber 1 will be closed, pocket I open, pocket I open, and I closed, and when at the other endlI is open, I and I closed, and I openthe same position relative to the cylinder being maintained by diametrically-opposite chambers.

As a convenient, and, perhaps, the simplest means for causing the reciprocating motions of the piston L, I provide a three-way rotary valve-seat, P, the passages f and f communicating, respectively, with the left and right hand ends of the cylinder, while f communicates with the exhaust.

In Figs. 4 and 5 are shown views of the valve Q, adapted to co-operate with the seat P, having recess g on one side, as shown, and the passage h, extending into one end and opening in the side opposite recess g. A suitable handle is connected with this valve, and the passage h communicates with the water-supply I through the casing, as shown.

When it is desired to move the piston to, say, the left-hand end. of the cylinder, the cock is turned so that the passage h in the valve registers with passage f in the seat, admitting pressure to the cylinder on the right-hand side of the piston, the passage f being at the same time placed in communication with the exhaust-passagef through recess g, so that the fluid in this end of the cylinder can be expelled by the advancing piston. The arrangement of the exhaust above the cylinder, so that the fluid will be forced. out instead of draining, is advantageous, as it provides for a constant and determined pressure, (usually the weight of the water, though a contracted discharge may be provided,) against which the advancing piston has to operate, and also prevents the admission of air to the cylinder, which would be objectionable when the pressure is admitted to that side of the piston,for obvious reasons. \Vhen the piston has reached the limit of the movement it is desirable to have itmake, the valve is reversed, admitting pressure to the passage f and exhausting fluid from the other side of the piston through f to exhaust f as will be readily. understood. Any other form of valve could, however, be provided, though I prefer this one.

Water may be applied to the grinding-cylinder in any suitable manner and the ground pulp removed at the bottom, whence it can be forced to any position desired.

The operation of the machine will now be readily understood.

Starting with the machine in the position shown, the operator opens the doors H H, communicating with the chambers or pockets I I and places the blocks of wood or other material from which the pulp is to be made in said chambers and starts the cylinder rotat' ing very rapidly. Then the valve Q is turned so as to admit pressure to the right-hand side of the piston, causing it to travel to the left, and the plates D D to press the blocks against the cylinder with great force. The pressure coming on opposite sides of the grinding-cylinder tends to relieve the bearings of unequal pressure and wear, and the full force of the piston-pressure is equalized on the cylinder.

As the blocks are ground away, the operating ends of the plates approach the cylinder, closing these chambers and opening the corresponding chambers at the opposite ends, and just before the piston reaches the limit of its stroke the doors to chambers I I are opened and blocks of material inserted therein. Then when the blocks first inserted are sufficiently ground the operator reverses the valve Q, causing the piston-rod to move in the opposite direction and clamp and hold the blocks in the last-filled chamber firmly against the cylinder, grinding them as before. Then there maining portions of the blocks remaining'in chambers I I drop down into the lower por tionof the chamber, and these and the fresh blocks inserted arepressed .against the cylinder upon the next reversal of the cylinder piston, and thus the operation is kept up con tinuously, the operator filling the chambers ing the operation continuous.

It is not at all essential that a hydraulic apparatus be employed to operate thepresserplates; but any suitable motor could as well be employed.

The manner of connecting the presserplates with each other, their construction, relation to each other, and manner of connection with the motor can be greatly varied without departing from the spirit of my invention, and I therefore do not desire to be understood as limiting myself to precisely what is herein shown.

It will be noted that by providing curved presser-plates and pivoting them close to the cylinder I am enabled to grind the blocks.

much smaller and with less waste than were a straight plate employed and moved radially upon it, and when the double presser-plates shown are employed this presents a further advantage, in that blocks inserted in the upper chambers and the pieces of the blocks first ground will drop down against the cylinder, wedging against the plate, so that when the motion of the presser-motor is reversed they-will bein contact and there will be no loss of motion.

It will be noted that each of the duplex presser-platesIembodies two pressing-surfaces arranged onopposite sides the pivotal point, and that when the plate is turned on the pivot they will move in opposite directions relative to the cylinder; also, that the upper ends of the two duplex plates are two pressing-surfaces connected for simultaneous operation in opposite directions relative to the cylinder.

I claim as my invention-- 1. The combination, with a grinding-cylinder, of two or more stock-pressing surfaces or plates for feeding material to the cylinder, connected for simultaneous operationin opposite directions relative to the portions of the cylinder-surface with which they co-operate, and a motor connected to said plates for causing their positive operation in both vdirections, substantially as described. 7

2. The combination, with a grinding-cylinder, of two pivoted stock-pressing surfaces or plates for feeding'material to the cylinder, connected for simultaneous, operation in opposite directions relative to the portions of the surface of the cylinder with which they co-operate, and a motor connected to said plates for causing their positive operation in both directions, substantially as described.

3. The combination, with a grinding-cylinder, of two pivoted presser-plates for feeding materialto the cylinder, both ends of each plate being adapted to be brought alternately in proximity to the cylinder-surface, connec:

tions between the plates for causing their. simultaneous operations on the pivots, and a motor for causing the positive movements of the plates, substantially as described.

4. The combination, with a grinding-cylinder, of two pivoted presser-plates for feeding material to the cylinder, both ends of each plate being adapted to be brought alternately into proximity to the cylinder-surface, connections between the proximate ends of the plates for causing their movements in the same direction, and a motor for causing the positive movements of the plates in both directions, substantially as described.

5. The combination, with a grinding-cylin V der, of two pivoted presser-plates for feeding the material to the cylinder, located on opposite sides of the same, both ends of each plate being adapted to be brought alternately in proximity to the cylinder-surface, connections between the corresponding ends of the plates, and a motor connected to the plates for causing their positive movements in both directions, substantially as described.

6. The combination, with a grinding-cylinder, of two pivoted presser-plates for feeding material to the cylinder, located on opposite sides of the same, both ends of each platebeing adapted to be brought alternately into proximity to the cylinder surface, a rod connecting the corresponding ends of the plates, and a motor for causing the positive movements of the rod in opposite directions, substantially as described.

7. The combination, with a grinding-cylinder, of two pivoted presser-plates for feeding material to the cylinder, both ends of each plate being adapted to-be brought alternately into proximity to the cylinder-surface, a rod connecting the proximate ends of the plates,

a piston connected to said rod, a cylinder in which the piston operates, and valve mechani'sm for admitting pressure on opposite sides of the piston to operate it positively inboth directions, substantially as described.

8. The combination, with the grinding-cylinder, of a pivoted presser-plate both ends of which are adapted to be brought alternately into proximity to the cylinder-surface, and a motor connected to the plate for moving it on its pivot, substantially as described.

9. The combination, with a grinding-cylinder, of a pivoted presser-plate both ends of which are adapted to be brought alternately into proximity to the cylinder-surface, and' adjustable bearings in which the plate is pivoted located substantially in the plane of the axis of the cylinder, and adjustable toward and from said cylinder, substantially as described.

10. The combination, with the grinding-cylinder, of a pivoted resser-plate both ends of which are adapted to be brought alternately into proximity to the cylinder-surface, the pivotal point of the plate being substantially in the plane of the cylinder-axis, and a rib on the plate on the side next the cylinder,-substantially in line with the plate-bearin gs, substantially as described.

11. The combination, with the main casing having a series of feeding-apertures and the grinding cylinder located therein, of two presser-plates for feeding material to the cylinder pivoted to the casing, both ends of each plate being adapted to be brought alternately into proximity to the cylinder-surface, a pressure-cylinder secured to the casing, a piston operating therein, and a piston-rod extending out at opposite ends, and links forming the connection between the rod ends and the presser-plates, substantially as described.

12. The combination, with the casing having the feeding-apertures and the grindingcylinder therein, of the presser-plates forfeeding material to the cylinder pivoted to the casing, both ends of each plate being adapted to be brought alternately into proximity to the grinding-cylinder surface, connections between the presser-plates for causing their simultaneous operations, and the segmental plates secured to the casing at the ends of the presser-plates, constituting the ends of the chambers in which they operate, substantially as described.

BERNERD EILERS, JR.

Witnesses:

FRED F. CHURCH, GEo. B. SELDEN. 

